This, "except."...................
1--Make SURE you have it fused, use an inline fuse if none is supplied
2--You didn't elaborate on the system---is this a one --piece radio, or does this have a separate (trunk) amp? How much audio output is it rated for? If it's much over 10W per channel (just picking a figure out of the air) you need heavier wire than you can tap into in the fuse box. In that case, you'll want to "get into" heavier points under the hood, like, say, the starter relay battery stud, and a "great big" fuse
3--You need to decide if you want to run the main radio power "constant" so you can have it on with the key off or out--or whether you only want the radio on switched accessory. There are two busses in the fuse panel. One is "constant" hot, the other is switched through the ACC of the ignition switch